The $810 Policy That Won't Save Your Design Firm

We hear it constantly: "We have liability insurance." As if that settles it. It doesn't. The dirty secret of policy comparison is that the wrong policy can leave you paying a judgment out of pocket while your insurer walks away. That single misconception—that any liability policy covers any liability claim—is the most expensive mistake small professional firms make.

Here's how we actually decide between policies. Imagine you run a 12-person structural engineering firm. You've got a $1 million general liability policy and a $1 million professional liability policy. A client's balcony collapses. The city inspector says your load calculations were wrong. The injured homeowner sues for bodily injury. Your client sues you for the cost of the failed project. Two claims, two policies, and if you bought them wrong, only one pays.

General Liability vs. Professional Liability: The Wrong Tool Problem

General liability—also called commercial general liability—covers third-party bodily injury and property damage. A visitor slips in your office. A crane drops a beam on a parked car. That's GL territory. Professional liability, often called errors and omissions, covers financial loss from mistakes in your professional services: a miscalculated load, a missed deadline, bad advice. As IRMI puts it, GL handles physical risks; PL handles the abstract ones (IRMI). Carrying both is the only way to close the gap (The Hartford).

The balcony scenario splits cleanly. The homeowner's bodily injury claim goes to GL. The developer's claim for rework and delay goes to PL. If you only had GL, the developer's financial loss would be uninsured—and you'd be writing that check yourself.

Occurrence vs. Claims-Made: The Clock That Decides Everything

This is where most comparisons go off the rails. General liability policies are occurrence-based: if the injury happened during the policy period, it's covered even if the claim arrives after the policy expires. Professional liability is usually claims-made-and-reported. That means the claim must be made and reported while the policy is active—and the incident must have happened on or after your retroactive date (The Hartford).

Imagine you switch PL carriers in January. Your new policy has a retroactive date of January 1. A client sues in March over a design you delivered last September. You're not covered. The prior policy might respond, but only if you bought an extended reporting period—typically 30 to 60 days, extendable to a year or more for extra premium (The Hartford). Miss that window and you're naked.

We tell every professional firm the same thing: never let a claims-made policy lapse without tail coverage, and never accept a retroactive date later than the day you first bought PL. It's the cheapest discipline in this business.

How Defense Costs Eat Your Limit

Here's the comparison most brokers gloss over. On a general liability policy, defense costs are typically paid in addition to the limit. On a professional liability policy, defense costs usually come out of the limit (IRMI). That difference can double the real-world value of your coverage—or halve it.

Say you carry a $1 million PL limit. The claim is defensible but costs $400,000 in attorney fees before trial. That leaves $600,000 to settle. If the demand is $800,000, you're $200,000 short before anyone signs anything. On a GL policy with the same limit and a defense-outside-the-limit structure, the full $1 million would still be available for the settlement. Same headline number, radically different protection.

Those limit benchmarks aren't arbitrary. $1 million per occurrence with a $2 million aggregate is the standard CGL structure, and most client contracts demand at least $1 million in GL (IRMI). On the PL side, limits commonly start at $1 million per claim, climbing to $2 million to $5 million or more for larger projects (IRMI).

Umbrella and Excess: Don't Confuse the Two

Once you've got the underlying policies right, you layer on top. Here the terminology matters more than most people realize. Excess liability extends the limits of one specific policy. Commercial umbrella extends the limits of multiple policies—general liability, auto, and others—which gives broader protection (The Hartford).

Umbrella policies are written with aggregate limits ranging from $1 million to $15 million (The Hartford). But there's a catch: you can't buy umbrella coverage without the underlying policy it sits on. No GL policy, no umbrella. And an umbrella won't extend your commercial property limits—property claims above your property policy limits come out of pocket (The Hartford).

For our hypothetical engineering firm, a $2 million umbrella sitting over the GL and auto policies costs far less per dollar of limit than raising the primary GL limit. That's how we'd structure it.

What Actually Drives the Decision

When we compare quotes side by side, we ignore the premium until we've checked four things:

• Does the PL policy include defense costs inside or outside the limit?
• What's the retroactive date, and does it match or precede our first day of PL coverage?
• Are the exclusions standard—intentional misconduct, fraud, criminal acts are always excluded (Cornell Law School Wex)—or is the carrier carving out something we actually do?
• Does the GL policy include product liability if we sell anything, and does it include third-party EPLI if customers interact with our staff?

On that last point: EPLI covers employment claims like wrongful termination, discrimination, and harassment, and it's often bundled into a Business Owner's Policy (The Hartford). For firms with employees, that bundling is usually the better buy. A BOP averages $1,687 a year across Hartford customers, versus roughly $810 for standalone general liability (The Hartford). For that difference you also get commercial property and business income coverage—worth it for most small firms.

The broader market matters too. Social inflation—driven by litigation funding, plaintiff attorney advertising, rising contingency fees, and eroding damage caps—has pushed settlements and awards up 27.5% on average between 2010 and 2019 (Triple-I). WTW notes that general liability and medical malpractice markets are moving counter-cyclically to the rest of insurance, with real concern about nuclear verdicts (Insurance Journal). Translation: don't assume next year's renewal will be cheaper, and don't buy the minimum limit just because the market has been soft.

For a design or engineering firm, our recommendation is straightforward: carry both GL and PL, set the PL retroactive date as early as the carrier will allow, buy tail coverage whenever you switch carriers, and layer an umbrella on top. The premium difference between a thoughtfully structured program and a cheap one is usually a few hundred dollars a year. The difference in what gets paid when a claim lands is the difference between a bad quarter and a closed business.

Sources

• IRMI - https://www.irmi.com/articles/expert-commentary/contractors-professional-liability-and-the-cgl
• The Hartford (Professional Liability) - https://www.thehartford.com/professional-liability-insurance
• The Hartford (General Liability) - https://www.thehartford.com/general-liability-insurance
• Triple-I - https://www.iii.org/article/social-inflation-hard-to-measure-important-to-understand
• Insurance Journal (WTW specialty market rates) - https://www.insurancejournal.com/news/international/2026/05/06/868716.htm